Talk:Pascal (unit)

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Contents 1 Mars atmospheric pressure 2 Hectopascal 3 Differential equations 4 1Pa = .. ? 5 pascal 6 Miscellany 7 Proposal to move page Pascal to Pascal (unit) 8 Who's going to fix the links to a disambiguation page? 9 Atmospheric pressure at sea level 10 Decimal group separator: space vs. comma 11 KPa to Atm 12 pages that redirect here without any notice! 13 Pascal

[edit] Mars atmospheric pressure

This artical say it is 1 kPa. The mars article says it is 0.1 kPa. One of these is wrong. My understanding is that it is 0.7-0.9 kPa which is just slightly above the point where water cannot exist in the liquid phase. Can those who made the wrong example make a correction? -- Terrell Larson

The Mars article (and other sources I checked) say it is typically 0.75 kPa. The 1 kPa order-of-magnitude figure that is given here seems to be a crude, but easy to memorize, valid, rounded version of that. Markus Kuhn 11:06, 30 Apr 2005 (UTC)

[edit] Hectopascal

Blaise Pascal was an important mathematician, but Galileo Galilei was the first person to weigh the atmosphere. The unit of atmospheric pressure (perhaps) should be the Galileo, not the hectopascal. Pascal didn't do much in the area of weighing the atmosphere. Millibar is the best term, though. Trudy June 28th, 2005 11:03 Z

Is this a comment regarding the article? Markus Kuhn 17:00, 17 August 2005 (UTC)

I'm with Markus. But the comment makes for interesting and informative discussion, so I think it belongs here. --Orthografer 03:32, 20 October 2005 (UTC)

The problem, of course, is that the galileo is already a unit named after Galileo Galilei. Too bad for his fans that this non-SI unit has been thrown out with the advent of our modern International System, though we still see far too many vestiges of its use. It is a centimeter-gram-second unit of acceleration, something with which Galileo is much more associated than atmospheric pressure. Of course, the normal name is the shortened version gal; spelling it as galileo is extremely rare. It's weird for the Wikipedia article to be listed under that name. Gene Nygaard 03:43, 20 October 2005 (UTC)

[edit] Differential equations

[edit] 1Pa = .. ?

1 pascal (Pa) = 1 N/m² = 1 J/m³ = 1 kg·m^–1·s^–2
Are you sure that it's " 1 kg·m^–1·s^–2 " without such thing as an area? that's only Mass/Acceleration...

Mass/Acceleration would be " 1 kg·m^–1·s⁺² ". " 1 kg·m^–1·s^–2 " is Mass times Acceleration (" 1 kg·m·s^–2 "), divided by area (m²), hence one Pa. --agr 20:39, 25 April 2006 (UTC)

Sorry to be such a novice/unwitting terrorist, but I made a change to the page and didn't include links or anything like that. I added that the Pa is equal to one Joule/m^3 since I think that's important. I also apologize for sticking this comment here, but I didn't think it warranted a new section.

[edit] pascal

messurment: of compressed energy in meter cubic.

What???? Peter Horn 03:23, 1 September 2006 (UTC)

Perhaps that was a reference to the fact that pressure is measured in the same units as energy density, and that the two quantities are related. --Heron 20:34, 12 September 2006 (UTC)

Pascal is normally only meant to be used for pressure and stress (source: ISO 31-0, table 2), i.e. quantities that represent force per area. Markus Kuhn 21:01, 12 September 2006 (UTC)

[edit] Miscellany

100 000 Pa devided by 101 325 Pa gives 750.062, not exactly 750 . Peter Horn 03:23, 1 September 2006 (UTC)

[edit] Who's going to fix the links to a disambiguation page?

Sorry I missed the discussion of the proposed move; I think it was a damn foolish idea.

But since it was moved, who is going to now step in and fix the 500 links to a disambiguation page at Pascal (click on What links here? for that page), and ensure that they go to the right article, rather than linking to a disambiguation page?

• Is it you, 71.4.99.4, the not only anonymous but unsigned proponent of this move? I'm going to hold you primarily responsible.
• Or is it you, GTBacchus, who actually made the move? I'm going to hold you responsible, too, since there is a high probablility of not getting the anonymous proponent to do so.
• How about Markus Kuhn, Salix alba, Beardo, Serge, Gazjo, and Duja? Do any of you intend to step in and help these editors out with this unaccomplished and necessary task?

Some things, such as redirects from ㎫, are no-brainers.

Whoever does it, once you get done, could you come back and tell us how many of those links went to the page that used to be there, and how many went somewhere else? That will give you a pretty good idea of how necessary that move was. Gene Nygaard 02:27, 19 September 2006 (UTC)

• The disambig argument is a good one, though I still would give support to the move, especially with the long term in mind (think 10 years). Can't a bot fix those links? Many of those links (50?) were to the wrong Pascal anyway but that's not relevant to this specific discussion (at least they're not 'wrong' now). For info: Blaise Pascal has about 400 links to it so it is just as a significant Pascal. Gazjo 05:22, 19 September 2006 (UTC)
•  :Heck, if we're counting links, one of the redirect pages to Pascal (programming language) alone has over 600. -GTBacchus^(talk) 04:37, 20 September 2006 (UTC)

Sure, I'll work on some of those. I don't see it as an big deal though; they'll get sorted out. Like Gazjo said, the pages are in the right place now, and the links will be fine, in some time. I'll do a few a day, and chip away at it. As far as getting an idea of "how necessary the move was", that sounds a bit fatuous, doesn't it? I just picked out 10 links, eight of which wanted to point to the unit, one to the programming language, and one to the philosopher. I'd rather a Blaise Pascal link point to a disambiguation page than a page about pressure measurement. -GTBacchus^(talk) 08:49, 19 September 2006 (UTC)

It's under 400 now. I got most of the ones that were for the programming language, I think. More later. -GTBacchus^(talk) 09:27, 19 September 2006 (UTC)

Most of the links that need fixing should actually have been to kPa, MPa, GPa, etc. and should have been fixed anyway. The list of pages that need fixing is getting smaller rapidly. Number of links is not a good measure of the dominant meaning of a term, especially for a unit of measure, which attracts a lot of links merely for technical reasons. The decision to move was certainly correct IMHO. Markus Kuhn 12:23, 19 September 2006 (UTC)

All of those pages like kPa redirect to Pascal (unit) now. During the move, I went ahead and snapped all the double redirects. Most of the incoming links seem to be of the form [[Pascal|kPa]] or something, so fixing the redirects didn't help them. -GTBacchus^(talk) 18:14, 19 September 2006 (UTC)

Down to 300 -GTBacchus^(talk) 04:34, 20 September 2006 (UTC)

200... -GTBacchus^(talk) 03:28, 27 September 2006 (UTC)

All main article name space links done. --Salix alba (talk) 14:59, 29 September 2006 (UTC)

[edit] Atmospheric pressure at sea level

One hectopascal corresponds to about 1% of atmospheric pressure (near sea level)..."

Is this right? According to Pascal (unit), "the average atmospheric pressure, at sea level, is about 101.3 kilopascals", and since one hectopascal is 10 times less than a kilopascal, one hectopascal should be 0.1% of atmospheric pressure, shouldn't it? Palefire 07:58, 17 January 2007 (UTC)

[edit] Decimal group separator: space vs. comma

In the article it says that 1 atm= 101 325. WTF is that? Is that 101 and 325? 101,325? What? WHO THE HELL WROTE THAT? —Preceding unsigned comment added by Paladin Hammer (talk • contribs) 01:19, 22 October 2007 (UTC)

It's a common notation that is a compromise for displaying high precision numbers, but MOS:NUM says we don't use it on Wikipedia, so I have changed it in the article.--agr 15:30, 22 October 2007 (UTC)

Various international standards (e.g., ISO 31-0) recommend that long numbers are split into groups of three digits, separated by a thin space, whereas the housestyle of the English-language Wikipedia requires to separate such groups of three digits with a comma. (The latter approach does not work in many other European languages, where a decimal comma is used.) It is pretty much the only area where the English Wikipedia MoS disagrees with international standards, but because many web browsers and keyboards still do not support a thin-space character (and NBSP is awkward to enter), the traditional English-style comma group separator has won. Markus Kuhn 08:14, 24 October 2007 (UTC)

[edit] KPa to Atm

It is my understanding that 101.364KPa is the same as 1 Atm,but the article states that it is 101.325Kpa,which is a big difference when doing a lengthy calculation and you need the unit as close to the decimal as possible. —Preceding unsigned comment added by 206.255.88.85 (talk) 22:53, 20 March 2008 (UTC)

[edit] pages that redirect here without any notice!

Redirect to the orders of magnitude page, OR , merge the magnitude page in please! I'm not much of an editor, so you get to decide. found it on google though :) (I marked out my own comment below)

I was doing a search for a term that I couldn't find even on google, GPa, and it redirected here, but using the browser's search tool to find it on the page yeilded only one result, the redirection notice.

Please fix this soon, someone, anyone? —Preceding unsigned comment added by 24.22.176.33 (talk) 01:58, 23 April 2008 (UTC)

[edit] Pascal

how much is 15 PAmin in L.s Is it 15 L.s of 900 L.s —Preceding unsigned comment added by 196.35.246.194 (talk) 13:19, 8 June 2008 (UTC)